twi.h

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//TWI状态定义
//MT 主方式传输  MR 主方式接收
#define START 0x08
#define RE_START 0x10
#define MT_SLA_ACK 0x18
#define MT_SLA_NOACK 0x20 
#define MT_DATA_ACK  0x28
#define MT_DATA_NOACK 0x30
#define MR_SLA_ACK  0x40
#define MR_SLA_NOACK 0x48
#define MR_DATA_ACK 0x50
#define MR_DATA_NOACK 0x58
//SR 从机方式接收  ST 从机方式传输  ALL  广播
#define SR_SLA_ACK        0x60
#define MT_SR_SLA_ACK     0x68
#define SR_ALL_ACK        0x70
#define MT_SR_ALL_ACK     0x78
#define SR_DATA_ACK	      0X80
#define SR_DATA_NOACK     0X88
#define SR_ALL_DATA_ACK   0x90
#define SR_ALL_DATA_NOACK 0x98
#define SR_STOP_RESTART   0xa0

#define ST_SLA_ACK		  0xa8
#define MT_ST_SLA_ACK     0xb0
#define ST_DATA_ACK       0xb8
#define ST_DATA_NOACK	  0xc0
#define ST_LAST_DATA_ACK 0xc8

//常用TWI操作(从模式写和从模式读)
#define TestAck() 	  (TWSR&0xf8)
#define Twi_ACK()	  (TWCR=(1<<TWEA)|(1<<TWINT)|(1<<TWEN)|(1<<TWIE))
#define Twi_NoACK()	  (TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWIE))
#define Write8Bit(x)  {TWDR=(x);TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWIE);}
#define SetAck()	  (TWCR=(1<<TWEA))
#define SetNoAck()    (TWCR&=~(1<<TWEA))
#define Stop()		  (TWCR=(1<<TWSTO)|(1<<TWINT)|(1<<TWEN)|(1<<TWIE))